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James H. Gilchrist

Cornell University

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Tetrahedron Letters | 1993

Lithium bis(2-adamantyl)amide: Structure and reactivity of an extremely hindered lithium dialkylamide

Kiyoshi Sakuma; James H. Gilchrist; Floyd E. Romesberg; Cresta E. Cajthaml; David B. Collum

Abstract The readily prepared title lithium amide is shown to be monomeric under all conditions, readily forms mixed aggregates with ketone enolates but not with lithium halides, and enolizes ketones with a very high E/Z selectivity.

Journal of the American Chemical Society | 1991

Effects of lithium salts on the stereochemistry of ketone enolization by lithium 2,2,6,6-tetramethylpiperidide (LiTMP). A convenient method for highly E-selective enolate formation

Patricia L. Hall; James H. Gilchrist; David B. Collum

Journal of the American Chemical Society | 1991

Mixed aggregation of lithium enolates and lithium halides with lithium 2,2,6,6-tetramethylpiperidide (LiTMP)

Patricia L. Hall; James H. Gilchrist; Aidan T. Harrison; David J. Fuller; David B. Collum

Journal of the American Chemical Society | 1991

The structure of lithium tetramethylpiperidide and lithium diisopropylamide in the presence of hexamethylphosphoramide: structure-dependent distribution of cyclic and open dimers, ion triplets, and monomers

Floyd E. Romesberg; James H. Gilchrist; Aidan T. Harrison; David J. Fuller; David B. Collum

Journal of the American Chemical Society | 1993

Structure of lithium hexamethyldisilazide in the presence of hexamethylphosphoramide. Spectroscopic and computational studies of monomers, dimers, and triple ions

Floyd E. Romesberg; Max P. Bernstein; James H. Gilchrist; Aidan T. Harrison; David J. Fuller; David B. Collum

Journal of the American Chemical Society | 1991

Lithium diisopropylamide mixed aggregates: structures and consequences on the stereochemistry of ketone enolate formation

Angela S. Galiano-Roth; Yong Joo Kim; James H. Gilchrist; Aidan T. Harrison; David J. Fuller; David B. Collum

Journal of the American Chemical Society | 1992

Distinction of symmetric lithium dialkylamide dimers from higher oligomers by inverse-detected nitrogen-15 homonuclear zero-quantum NMR spectroscopy

James H. Gilchrist; David B. Collum

Journal of the American Chemical Society | 1997

MECHANISM OF LITHIUM DIISOPROPYLAMIDE-MEDIATED ESTER DEPROTONATION : THE ROLE OF DISOLVATED MONOMERS

Xiufeng Sun; Sarita L. Kenkre; Julius Remenar; James H. Gilchrist; David B. Collum

Journal of the American Chemical Society | 1996

New NMR spectroscopic probe of the absolute stereoselectivity for metal-hydride and metal-alkyl additions to the carbon-carbon double bond. Demonstration with a single-component, isospecific Ziegler-Natta {alpha}-olefin polymerization catalyst

James H. Gilchrist; John E. Bercaw

Journal of the American Chemical Society | 1990

Lithium-6 and nitrogen-15 nuclear magnetic resonance spectroscopic studies of lithiated cyclohexanone phenylimine revisited. Aggregation-state determination by single-frequency nitrogen-15 decoupling

James H. Gilchrist; Aidan T. Harrison; David J. Fuller; David B. Collum

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David B. Collum

Cornell University

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Aidan T. Harrison

Cornell University

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David J. Fuller

Cornell University

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Floyd E. Romesberg

Scripps Research Institute

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Patricia L. Hall

Cornell University

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Kiyoshi Sakuma

Showa Denko

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Cresta E. Cajthaml

Cornell University

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John E. Bercaw

California Institute of Technology

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Julius Remenar

Cornell University

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Max P. Bernstein

Cornell University

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